A simple glossary of terms used in home energy performance, testing, and code compliance.
ACH50
Air Changes per Hour at 50 Pascals — a measure of airtightness from a blower door test.
Learn more:
Blower Door Testing
CFM25
Cubic Feet per Minute of duct leakage measured at 25 Pascals.
Learn more:
Duct Leakage Testing
HERS Index
A numerical score representing a home’s energy efficiency.
Learn more:
Understanding Your HERS Score
RESNET
Residential Energy Services Network — the national authority governing HERS Ratings.
MA Stretch Code
A stricter version of the MA energy code requiring higher performance standards.
Details:
Code Compliance in MA & RI
IECC
International Energy Conservation Code — basis for RI’s statewide energy code.
